HT82V46 View Datasheet(PDF) - Holtek Semiconductor
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Description
Manufacturer
HT82V46 Datasheet PDF : 27 Pages
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HT82V46
Serial Control Interface
The internal control registers are programmable and
can be read-back via the serial control interface and
pin OD[7]/SDO.
Register Write (A4=0)
SCK, SDI and SEN are used for register writing. A
address A[5:0] is clocked in through SDI, followed by
a data word D[7:0]. Each bit is latched on the rising
edge of SCK. When the data has been shifted into the
device, a pulse is applied to SEN to transfer the data
to the appropriate internal register.
Register Read-back (A4=1 and D[7:0] is don’t Cared
at Register Write Cycle)
Read-back is initiated by Register Write as described
above but with A4 set to 1, followed by an 8-bit
dummy data word. Writing address (A5, 1, A3,
A2, A1, A0) will cause the contents D[7:0] of
corresponding register(A5, 1, A3, A2, A1, A0) to be
output D[7:0] on pin SDO/OD[7] at the falling edge
of SCK. SDO/OD[7] is shared pin, therefore OEB
pin should always be held low and the OPD register
bit should be set low when register read-back data is
expected on this pin. The next word may be read in to
SDI while the previous word is still being output on
SDO/OD[7] pin.
Note: To ensure all registers are set to their default
values it is recommended that a software-reset
is carried out after the power-up sequence,
before writing to any other register.
SCK
t SDIS
SDI
A5
Register Write Cycle
t SCK
t SDIH
A4
A[3:0]
D[7:0]
t CKFENR
SEN
t ENFSD7
SDO/OD[7]
OD[7]
t ENFCKR
t CKFSD6
t CKFOD7
D7
D6
D[5:1]
D0
OEB
Register Write: A4=0
Register read-back: A4=1 (D[7:0] don´t care at write cycle)
Figure 15 Serial Control Interface Timing
Rev. 1.10
17
November 24, 2011
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